Figure 3
EXAFS spectra (Au L3) of gold nanoparticles on mesoporous materials [as-prepared: (a) Au MCM-41 (a); (b) Au MCM-41 (a) (heat treated at 473 K, 3 h); (c) Au MCM-41 (a) (heat treated at 823 K, 3 h); (d) Au MCM-41 (a) (heat treated at 1113 K, 3 h); (e) Au MCM-41 (a) (heat treated at 1273 K, 3 h)]. The solid lines are experimental data and the overlaid dotted lines are best fits (calculated). The lower curve in each shows the residuals. |